First Q in a couple of years.. Regex help

Hey all..

I am trying to replace "\n" to '<br />' BUT, not inside

PHP:

<?php ?> or tags..

Any suggestions?

Josh

Ive tried figuring out negative lookbehind assertion things but I am not too sure..
#\n(!<?php+)#sie

 

/((?:\\n(?<!(?:.*?)?<\?(php)?(?:.*?)?))|(?:\\n(?<=(?:.*?)?\?>(?:.*?)?)))/si

PHP:

that will match any \n that is no inside of <? ?> or <?php ?>
there might be a shorter method but meh, this works

edit: could use a little work though. will only work if there is 1 set of php braces.

 

A lookbehind must be fixed width in most regex flavors, including PHP.

Personally I'd be tempted to do this by first replacing all the "\n" within the <?php ?> blocks (since that's very easy to find) to something else. Then you can safely convert any remaining \n to <br />, and do a final replace to get the \n back from within the <?php ?> tags. Untested but something like:

$string = preg_replace('#<\?(?:php)?(.*?)\?>#se', 'str_replace("\n", "__PRESERVEn__", stripslashes(\'\\1\'))', $string);
$string = str_replace("\n",'<br />',$string);
$string = str_replace('__PRESERVEn__',"\n",$string);

PHP:

 

Thanks for the quick replies, but I am still having trouble...

Heres what I am doing right now:

	function acms_nl2br($text)
	{
		$text = str_replace("\r", '', $text);
		$text = str_replace("\n", '<br />', $text);

		return $text;
	}

PHP:

	function parse_bbcode($text, $nl2br='0')
	{
		$text = $this -> parse_bbcode_codetag($text);
		$text = $this -> parse_bbcode_phptag($text);
		$text = $this -> parse_smilies($text);

		if ($nl2br != 0)
		{
			$text = $this -> acms_nl2br($text);
		}
... plus some more here...

PHP:

Now, if I do NL2BR after I call the php bbcode parser I get a blank line before and after the <?php ?> which is done like so..

$replacement = $start_html . highlight_string("<?php\n" . $after_replace . "\n?>", 1) . $end_html;

Now... If I replace all <br /> from inside the php function to \n - it shows up perfectly at the cost of ruining the nl2br formatting everywhere else (IF I CALL NL2BR BEFORE CALLING THE PHP TAG)...



If I call nl2br before, then replace from within php (which is essentially like not calling it)




EDIT: Ok, Im trying to call the nl2br first, then inside the php function I can replace all brs with newlines inside

PHP:

If I find a solution Ill post Thanks all



EDIT: No sleep really screws you over... I was using preg_match_all to locate the php tags, basically you simply replace the match with
$matches[1][$i] = str_replace('<br />', "\n", $matches[1][$i]);